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Spiritual Sanctuary.
Places with high concentrations of Spiritual Energy would often times receive these names.
They could be as small as just a dozen meters, and other times, expand across many kilometers.
They characterized by having a heavier atmosphere, with higher concentrations of Mana, and sometimes, a lot of "colorful glow" that people would sometimes notice.
Of course, those with little magic sensitivity would never be able to tell, but often times, there was another big thing telling these places instantly.
They were, most of the time, full of Spiritual Crystals growing everywhere, usually over trees, preferring to take upon the tree's life force to expand quickly, like parasites.
Spiritual Crystals or Stones were crystallizations of spirit energy and therefore, technically not alive, but at the same time they grew where there was a lot of spirit energy, mana, and life energy to drain.